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It sounds like your parental permissions are on for some reason. On the home screen, press the menu button (the X1's equivalent of the start button), select settings and then find the parental controls (I can't remember the name of the menu item, but it's pretty obvious). You can choose the overall setting, or customize different individual options...one of which is to allow/disallow multiplayer gaming.
I'm not really from outerspace. http://img223.imageshack.us/img223/4858/keitaibuddhavg2.jpg